xfrmi: drop ignore_df check before updating pmtu

commit 45a36a18d01907710bad5258d81f76c18882ad88 upstream.

xfrm interfaces currently test for !skb->ignore_df when deciding
whether to update the pmtu on the skb's dst. Because of this, no pmtu
exception is created when we do something like:

    ping -s 1438 <dest>

By dropping this check, the pmtu exception will be created and the
next ping attempt will work.

Fixes: f203b76d7809 ("xfrm: Add virtual xfrm interfaces")
Reported-by: Xiumei Mu <xmu@redhat.com>
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c
index b615729812e5acd1c1be39f402db5a9a6061e25d..ade2eba863b396e7bf250d6f7832f08eef3ff2af 100644 (file)
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -292,7 +292,7 @@ xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
        }
 
        mtu = dst_mtu(dst);
-       if (!skb->ignore_df && skb->len > mtu) {
+       if (skb->len > mtu) {
                skb_dst_update_pmtu_no_confirm(skb, mtu);
 
                if (skb->protocol == htons(ETH_P_IPV6)) {